182RG Electrical System Question

182RG Electrical System Question

I am having a problem (or is it a problem?) where when I am in flight I get a momentary electrical discharge that will make the ammeter needle spike all the way to the "-" side and produce a click in my headset, almost like keying the microphone.  It happens every time I fly but not with any regularity.  I suspect that it may be the hydraulic powerpack maintaining pressure in the landing gear system, but I don't have any detectable leaks and I would expect an internal leak would produce the spike at a regular interval.  Because it is so brief, I don't hear the pump running as I do when raising or lowering the gear, and when I do operate the gear I don't get a large needle deflection on the ammeter.

I would appreciate hearing from anyone that might have experienced the same problem and what you did to fix it.  It would be a minor annoyance except the spike seems to be pretty dramatic, if only for a split second. I am concerned that something might eventually short our and with that amount of current draw could potentially cause a serious problem.  I have check the engine and panel wiring as best I could during my last annual, and replace wires or connectors that were suspect.

Thanks

Jon

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Re: 182RG Electrical System Question

Did you find out the problem?

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Re: 182RG Electrical System Question

No. So far 88 people have read the posting but no suggestions.  I will post what I find.

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Re: 182RG Electrical System Question

It has been a few months since this post.  Since then I replaced the battery and starter contactors, replaced or repaired some wiring, and swapped out the voltage regulator.  Still getting the momentary ammeter discharge indications.  Am dusting off this earlier posting in hopes of hearing from anyone with an idea as to what might be causing the problem.  I am guessing it is something on the alternator side of the ammeter, but since it connects to the bus bar it could be coming from anything.

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Re: 182RG Electrical System Question

Sounds like there might be a wire with a minor loose ground, or dirty connection.  With it happening so quickly and infrequently, it will be difficult to track down, since, it is unlikely to be duplicated.  Have you noticed anything specfic to the time that it happens?  ie altituide, power setting, instruments on, weather outside, temperature?

Tom
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Re: 182RG Electrical System Question

May have solved my own problem.  Was sitting in the plane with the BATT side of the master switch on while recalibrating my Zaon XRX unit.  As is ussual, the hydraulic power pack motor ran for a second to pressurize the system and then shut off.  About 3 minutes later, it ran for a fraction of a second again and then stopped.  I noticed the ammeter needle spike negative when it happened.  Did it a few more times before I was done.  Looked at the power pack and noticed hydraulic fluid around the base of the pressure switch.  Looks like I might have a leak.  Will post an update after replacing the seal to see if that fixes the problem.

Jon

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Re: 182RG Electrical System Question

Last Friday I pulled the pressure switch and replaced the seal and 2 o-rings, then yesterday (Saturday) flew the plane for 1 1/2 hours.  Ammeter did not spike once.  Rechecked the switch when I got back on the ground and there was no hydraulic fluid around the switch, so I think that fixed the problem.

However, in looking at the schematic I am wondering if the pump should have run at all on the ground since I believe the Squat Switch would break the pump circuit with the weight of the airplane sitting on the main gear.  Will have to check that next.  Always something to fix on a 33 year old airplane.

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